"to fish with a hook," mid-15c., from Old English angel (n.) "angle, hook, fish-hook," related to anga "hook," from Proto-Germanic *angul-, from PIE *ankulo-, suffixed form of root *ang-/*ank- "to bend" (see angle (n.)). Compare Old English angul, Old Norse öngull, Old High German angul, German Angel "fishhook." Figurative sense "catch or elicit by artful wiles" is recorded from 1580s. Related: Angled; angling.
Others are reading
Definitions of angler from WordNet
a scheming person; someone who schemes to gain an advantage;
a fisherman who uses a hook and line;
fishes having large mouths with a wormlike filament attached for luring prey;
Synonyms: goosefish / anglerfish / angler fish / monkfish / lotte / allmouth / Lophius Americanus